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突发事件下,不同方向的应急车辆同时到达交叉口竞争绿灯相位。为减少应急车辆在交叉口的延误,以车辆总停留时间最小为目标,综合考虑各相位的期望将来停留时间和应急车流量比,得到各个相位的优先权。根据当前相位和下一相位的队长和应急车流量比,采用模糊Petri网方法确定当前相位的最佳绿灯时间,并给出了具体的信号优先控制策略。仿真结果表明,当应急车流量比由0.1增加到0.6时,由于对应相位的优先权增大,实际执行绿灯时间接近于相位清空时间,部分应急车辆可以不在交叉口停留直接通过,应急车辆的交叉口平均延误由22.43 s下降到20.41 s。可见,该方法可以有效降低应急车辆的交叉口延误。
Emergency, emergency vehicles in different directions at the same time to reach the intersection of competition green light phase. In order to reduce the delay of emergency vehicles at the intersection, aiming at the minimum vehicle total stay time, the priority of each phase is obtained by comprehensively considering the expectation of each phase in the future and the emergency traffic ratio. According to the current phase and the next phase of the captain and the emergency traffic flow ratio, the use of fuzzy Petri net method to determine the best green light time of the current phase and gives the specific signal priority control strategy. The simulation results show that when the emergency traffic flow rate increases from 0.1 to 0.6, the actual green light time is close to the phase emptying time as the priority of the corresponding phase increases. Some of the emergency vehicles may not directly pass through the intersection and the cross of the emergency vehicles The average delay in port decreased from 22.43 s to 20.41 s. Can be seen, this method can effectively reduce the delay of emergency vehicles intersection.